CN101594304A - Prevent that pile system from producing the method for loop and the member device in the pile system - Google Patents
Prevent that pile system from producing the method for loop and the member device in the pile system Download PDFInfo
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Abstract
The invention discloses a kind of pile system that prevents and produce the method for loop and the member device in a kind of pile system, described method comprises: the member device in the pile system receives message by stacking opening; Judge whether received packet is the known unicast message; If then received packet is transmitted processing; Otherwise, received packet is carried out the loop inspection, if detect the generation loop, then abandon received packet, if do not detect the generation loop, then received packet is transmitted processing.Use the present invention can avoid when accepting the loop inspection, being abandoned, and do not influence loop inspection effect by mistake through the message of re-orientation processes.
Description
Technical field
The present invention relates to the technology of piling up in the data communication network field, be specifically related to a kind of pile system that prevents and produce the method for loop and the member device in a kind of pile system.
Background technology
Along with the rapid increase of network size, the technology of piling up is arisen at the historic moment.The technology of piling up is meant two or many network equipments is coupled together by stacking opening, forms pile system.From in logic, the network equipment that is stacked is equivalent to same equipment, and the user management pile system is just as equipment of management.
Fig. 1 is the pile system structural representation of a kind of 4 equipment stackings in the prior art.As shown in Figure 1, pile system comprises a plurality of by piling up many network equipments that cable links together, and these network equipments are called member device.Each member device is provided with two stacking opening at most, is called stacking opening 1 and stacking opening 2.Each stacking opening is polymerized by a plurality of member ports.For adjacent two device A and B, the stacking opening 1 of A and the stacking opening 2 of B link to each other.
In pile system, when the topology of pile system changes, each member device is according to the connection situation of current topology, the shortest path of this equipment of calculating between other member device, thus the message that obtains from this equipment to other member device from which stacking opening of this equipment forwards.Then, generate forwarding route table according to the shortest path that calculates.
With the topology connection situation among Fig. 1 is example, and suppose that equipment 1 calculates this equipment and is specially to the shortest path between other member device: equipment 1 is path 12 to the shortest path between the equipment 2, and message slave unit 1 is walked stacking opening 1 to equipment 2 so; Equipment 1 is that path 12 adds path 23 to the shortest path between the equipment 3, and message slave unit 1 is walked stacking opening 1 to equipment 3 so; Equipment 1 is path 41 to the shortest path between the equipment 4, and message slave unit 1 is walked stacking opening 2 to equipment 4 so.Equipment 1 needn't be walked stacking opening to self.Generate the forwarding route table of equipment 1 as shown in table 1 according to the result of calculation of this shortest path.And then the hardware forwarding table item is set according to forwarding route table, guarantee that message can forward via correct stacking opening.
| Destination device | Equipment 1 | Equipment 2 | Equipment 3 | Equipment 4 |
| The stacking opening of selecting | ?-- | Stacking opening 1 | Stacking opening 1 | Stacking opening 2 |
Table 1
After message enters pile system from the pile system outside, search hardware forwarding table by message incoming interface place equipment, determine destination device and the outgoing interface of message in pile system, and then determine to transmit the stacking opening of this message, then message is sent to destination device by the stacking opening of determining.Before sending, also need on message, add and pile up heading, this piles up heading and comprises source device information, incoming interface information, destination device information and outgoing interface information.
In receiving from pile system by stacking opening, member's equipment during the message of other member device,, judges whether self is the destination device of message according to the destination device information that message carries; If then message is sent to the pile system outside from outgoing interface; If not, then destination device information searching self hardware forwarding table and the continuation of carrying according to message transmitted to the message destination device.
In pile system, message need be transmitted along the shortest path between the source and destination, if the message that certain member device sends by stacking opening 1, the stacking opening 2 from oneself receives again, and sends from stacking opening 1 once more, then forms loop; The perhaps message that sends by stacking opening 1 of certain member device around after the circle, is received from the stacking opening 1 of oneself again in pile system, then also forms loop.The phenomenon of this message Cheng Huan can cause broadcast storm, thereby available bandwidth in the system is exhausted, and makes whole system unavailable.
In order to prevent message Cheng Huan, the loop inspection can be set in pile system, produce loop to prevent pile system.For example, a kind of loop test mode is each member device when receiving message from other member device, according to the source device information that message carries, judges whether the source device of received packet is self, if, dropping packets then, otherwise normally transmit.
But this loop test mode also is not suitable for the pile system that is mounted with the application subcard.Fig. 2 is that the application subcard is articulated in the schematic diagram on the stacked system equipment 3 shown in Figure 1.This uses subcard can be for application controls gateway (ACG, Application Control Gateway) subcard, such as the safe subcard of intrusion prevention system (IPS, Intrusion Prevention System) subcard, or the like.The application subcard is each member device service in the whole pile system.Need use subcard when certain member device and handle message, when using subcard not on this member device, then this member device arrives message redirecting by the mode that is redirected and uses subcard place member device.After using subcard and handling message, use subcard place member device and be message and determine destination device and outgoing interface and transmit.
Referring to Fig. 2, to suppose to use subcard and be articulated on the equipment 3, flow slave unit 2 enters, and needs to use the processing of subcard, is forwarded to equipment 1 after treatment again.In this case, after equipment 2 receives message, inserting equipment of itself information in the header as source device information for piling up of message interpolation, message is redirected to the processing that receives the application subcard on the equipment 3, after using the subcard processing, equipment 3 is searched destination device and outgoing interface for message and is transmitted.Suppose that slave unit 3 walks the stacking opening 2 of equipment 3 to equipment 1, message is transmitted back on the equipment 2 by stacking opening 2 so.Because the source device information of message is constant usually in the repeating process, this moment, equipment 2 was received the message of source device for self from stacking opening 1, and equipment 2 will abandon this message, thereby leads to errors generation.
As seen, the above-mentioned pile system that prevents produces the loop scheme, may cause the message through being redirected to the service subcard processing to be abandoned by mistake when accepting the loop inspection, therefore is not suitable for the pile system with service subcard.
Summary of the invention
In view of this, the invention provides a kind of pile system that prevents and produce the method for loop, can avoid message when accepting the loop inspection, to be abandoned by mistake through being redirected to the service subcard processing.
Member device in the pile system receives message by stacking opening, judges whether received packet is the known unicast message; If then received packet is transmitted processing; Otherwise, received packet is carried out the loop inspection, if detect the generation loop, then abandon received packet, if do not detect the generation loop, then received packet is transmitted processing.
This method further comprises: search the member device of destination device and outgoing interface for message, when destination device that does not find unicast message and outgoing interface, determine that this unicast message is the unknown unicast message, for the unknown unicast message is stamped the unknown unicast sign;
In this case, describedly judge that whether received packet for the known unicast message is: if received packet is carried the unknown unicast sign, and not broadcasting packet, neither multicast message, judge that then received packet is the known unicast message.
This method further comprises: the incoming interface place member device of message Q piles up heading for message Q adds, and writes down source device information in the heading described piling up;
In this case, describedly received packet carried out the loop inspection comprise:
The source device information that member device carries according to received packet judges whether the source device of received packet is self, if then determine to produce loop;
Whether the stacking opening of judging this received packet of actual reception is the stacking opening of the source device of this received packet to the shortest path correspondence between self, if not, then determine to produce loop.
This method further comprises: member device calculates the shortest path of self other each member device in the pile system according to current topological connection situation after the topology of pile system is determined; According to shortest path result of calculation, issue corresponding acl rule to self each stacking opening respectively;
The acl rule that issues to stacking opening x comprises following 4 class acl rules:
The matching condition of first kind acl rule is: the highest order of the target MAC (Media Access Control) address of received packet is 1, and the source device of received packet is a stacking opening x place equipment;
The matching condition of the second class acl rule is: the highest order of the target MAC (Media Access Control) address of received packet is 1, and the source device of received packet is stacking opening x each member device by non-shortest path connection;
The matching condition of the 3rd class acl rule is: received packet is carried the unknown unicast sign, and the source device of received packet is a stacking opening x place equipment;
The matching condition of the 4th class acl rule is: received packet is carried the unknown unicast sign, and the source device of received packet is stacking opening x each member device by non-shortest path connection;
Describedly judge that whether received packet is that the operation and the described operation that received packet is carried out the loop inspection of known unicast message comprises: according to the acl rule that issues for the stacking opening of actual reception message, judge that whether received packet is complementary with any one acl rule wherein, if then abandon received packet; Otherwise, received packet is transmitted processing.
This method further comprises: member device issues all relevant acl rules to self each stacking opening respectively when initialization; The acl rule that issues to stacking opening x comprises following 2 class acl rules:
The matching condition of a class acl rule is: the highest order of the target MAC (Media Access Control) address of received packet is 1, and the source device of received packet is each equipment that disposes for pile system in advance;
The matching condition of b class acl rule is: received packet is carried the unknown unicast sign, and the source device of received packet is each equipment that disposes for pile system in advance.
Each member device calculates the shortest path of self other each member device in the pile system according to current topological connection situation after the topology of pile system is determined; According to shortest path result of calculation, enable neutralize effective acl rule in the b class acl rule of a class acl rule;
The effective acl rule that enables for stacking opening x comprises:
In a class acl rule, matching condition be the highest order of the target MAC (Media Access Control) address of received packet be 1 and the source device of received packet be the acl rule of stacking opening x place equipment;
In a class acl rule, matching condition is that the highest order of the target MAC (Media Access Control) address of received packet is 1 and the acl rule of the source device of received packet each member device that to be stacking opening x connect by non-shortest path;
In the b class acl rule, matching condition is that the source device that received packet is carried unknown unicast sign and received packet is the acl rule of stacking opening x place equipment;
In the b class acl rule, matching condition is the acl rule of source device that received packet is carried unknown unicast sign and received packet each member device that to be stacking opening x connect by non-shortest path;
Describedly judge that whether received packet is that the operation and the described operation that received packet is carried out the loop inspection of known unicast message comprises: according to the effective acl rule that enables for the stacking opening of actual reception message, judge that whether received packet is complementary with any one effective acl rule wherein, if then abandon received packet; Otherwise, received packet is transmitted processing.
The present invention also provides a kind of pile system that prevents to produce the stack member apparatus of loop, can avoid the message through being redirected to the service subcard processing to be abandoned by mistake when accepting the loop inspection.
This member device comprises: loop inspection unit and retransmission unit;
Described loop inspection unit is used for receiving message by stacking opening, judges whether received packet is the known unicast message; If then received packet is sent to described retransmission unit; Otherwise, received packet is carried out the loop inspection, if detect the generation loop, then abandon received packet, if do not detect the generation loop, then received packet is sent to described retransmission unit;
Described retransmission unit is used for the message that is received is transmitted processing.
This member device further comprises message process unit, be used to message to search destination device and outgoing interface, if do not find the destination device and the outgoing interface of unicast message, determine that then this unicast message is the unknown unicast message, for the unknown unicast message is stamped the unknown unicast sign;
Described loop inspection unit is when judging whether the message that receives by stacking opening is the known unicast message, if received packet is not carried the unknown unicast sign, and not broadcasting packet, in the time of neither multicast message, judge that then received packet is the known unicast message.
Described message process unit is further used for, and piles up heading for the message that is received from the pile system outside adds, and writes down source device information in the heading described piling up;
Described loop inspection unit according to the source device information that received packet is carried, judges whether the source device of received packet is the place member device when carrying out the loop inspection, if then determine to produce loop; Whether the stacking opening of judging this received packet of actual reception is the stacking opening of the source device of received packet to the shortest path correspondence between the member device of place, if not, then determine to produce loop.
Described loop inspection unit comprises and piles up that topography module, ACL issue module, ACL is provided with module and checks module;
The described topography module that piles up, be used for after the topology of pile system is determined, calculate place member device shortest path between other each member device in the pile system according to current topological connection situation, shortest path result of calculation is sent to described ACL issue module;
Described ACL issues module, is used for according to shortest path result of calculation, determines the acl rule of each stacking opening correspondence of place member device, and is handed down to described ACL module is set;
The acl rule of stacking opening x correspondence comprises following 4 class acl rules:
The matching condition of first kind acl rule is: the highest order of the target MAC (Media Access Control) address of received packet is 1, and the source device of received packet is a stacking opening x place equipment;
The matching condition of the second class acl rule is: the highest order of the target MAC (Media Access Control) address of received packet is 1, and the source device of received packet is stacking opening x each member device by non-shortest path connection;
The matching condition of the 3rd class acl rule is: received packet is carried the unknown unicast sign, and the source device of received packet is a stacking opening x place equipment;
The matching condition of the 4th class acl rule is: received packet is carried the unknown unicast sign, and the source device of received packet is stacking opening x each member device by non-shortest path connection;
Described ACL is provided with module, is used to receive the acl rule that described ACL issues each stacking opening correspondence that module issues, and is set to corresponding stacking opening respectively;
Described inspection module is used for receiving message by stacking opening, according to the acl rule that be the stacking opening setting of this message of actual reception, judges that whether received packet is complementary with any one acl rule wherein, if abandon received packet; Otherwise, received packet is sent to described retransmission unit.
Perhaps, described loop inspection unit comprises that ACL issues module and ACL is provided with module;
Described ACL issues module, is used for when initialization, all the relevant acl rules of each stacking opening correspondence in the member device of place is handed down to described ACL module is set; The relevant acl rule of all of stacking opening x correspondence comprises following 2 class acl rules:
The matching condition of a class acl rule is: the highest order of the target MAC (Media Access Control) address of received packet is 1, and the source device of received packet is each equipment for the pile system configuration;
The matching condition of b class acl rule is: received packet is carried the unknown unicast sign, and the source device of received packet is each equipment for the pile system configuration;
Described ACL is provided with module and is used to receive all relevant acl rules that described ACL issues each stacking opening correspondence that module issues, and is set to corresponding stacking opening respectively.
Described loop inspection unit also comprises and piles up topography module and check module;
The described topography module that piles up, be used for after the topology of pile system is determined, calculate place member device shortest path between other each member device in the pile system according to current topological connection situation, shortest path result of calculation is sent to described ACL issue module;
Described ACL issues module and is further used for, and when receiving described shortest path result of calculation, according to shortest path result of calculation, determines neutralize effective acl rule in the b class acl rule of a class acl rule, and notifies described ACL that module is set;
Effective acl rule of determining for stacking opening x comprises:
In a class acl rule, matching condition be the highest order of the target MAC (Media Access Control) address of received packet be 1 and the source device of received packet be the acl rule of stacking opening x place member device;
In a class acl rule, matching condition is that the highest order of the target MAC (Media Access Control) address of received packet is 1 and the acl rule of the source device of received packet each member device that to be stacking opening x connect by non-shortest path;
In the b class acl rule, matching condition is that the source device that received packet is carried unknown unicast sign and received packet is the acl rule of stacking opening x place member device;
In the b class acl rule, matching condition is the acl rule of source device that received packet is carried unknown unicast sign and received packet each member device that to be stacking opening x connect by non-shortest path;
Described ACL is provided with module and is further used for, and when receiving when issuing the notice of module from described ACL, enables the effective acl rule that is provided with into each stacking opening;
Described inspection module is used for receiving message by stacking opening, according to the effective acl rule that be the stacking opening setting of this message of actual reception, judges that whether received packet is complementary with any one effective acl rule wherein, if abandon received packet; Otherwise, received packet is sent to described retransmission unit.
According to above technical scheme as seen, use the present invention by to comprising service subcard, need the stacked environment of re-orientation processes to analyze discovery, the message that is redirected to service subcard acceptance processing is the known unicast message, and the forward-path of known unicast message in pile system determined, can not cause loop, therefore need not the known unicast message is carried out the loop inspection.Therefore, the present invention only carries out the loop inspection to broadcasting packet, multicast message and unknown unicast message, thereby avoids being dropped when accepting the loop inspection through the message after the re-orientation processes, and can not influence loop inspection effect.
Description of drawings
Fig. 1 is a kind of pile system structural representation of 4 equipment stackings.
Fig. 2 is a kind of schematic diagram of using on the equipment 3 that subcard is articulated in pile system shown in Figure 1.
Fig. 3 realizes preventing that for a kind of acl rule that adopts in the embodiment of the invention pile system from producing the method flow diagram of loop.
Fig. 4 realizes preventing that for the another kind of acl rule that adopts in the embodiment of the invention pile system from producing the method flow diagram of loop.
Fig. 5 is the chain topology that forms after the change in topology among Fig. 2.
Fig. 6 is the structural representation of member device in the embodiment of the invention.
Fig. 7 is the structural representation of Fig. 6 intermediate ring road inspection unit 62.
Embodiment
Below in conjunction with the accompanying drawing embodiment that develops simultaneously, describe the present invention.
For having service subcard and the pile system of redirected demand being arranged, being redirected to the flow that service subcard handles is the flow that message characteristic and pre-defined rule are complementary, and this flow has known message characteristic.And under this particular environment of the pile system with service subcard, the flow that is redirected to service subcard must be a unicast message.Therefore, in having the pile system of service subcard, the unicast message that only possesses known message characteristic is the known unicast message, the situation that service subcard is accepted processing can occur being redirected to.
By above-mentioned to having the application subcard, and there is the stacked environment of redirected demand to analyze discovery, the message that is redirected to the service subcard processing is the known unicast message, therefore, the present invention only otherwise the known unicast message is carried out the loop inspection can avoid the message through being redirected to after service subcard is handled to be dropped when loop is checked accepting.And, because in pile system, the known unicast message can be transmitted along shortest path, this shortest path is stack system topological determined optimal path when setting up, therefore the forward-path of known unicast message in pile system can not cause loop, the known unicast message not being carried out the loop inspection so can not influence loop inspection effect yet, can reach equally to prevent that pile system from producing the purpose of loop.
Based on above-mentioned thought, the loop generation scheme that prevents that the embodiment of the invention provides is: the member device in the pile system receives the message from other member device in the pile system, judges whether received packet is the known unicast message; If then received packet is transmitted processing; Otherwise, received packet is carried out the loop inspection, if detect the generation loop, then abandon received packet, if do not detect the generation loop, then received packet is transmitted processing.
This scheme is not only applicable to have the pile system of service subcard, and is applicable to the pile system with service subcard.Be not only applicable to the pile system of ring topology, also be applicable to the pile system of other than ring type topology.
Wherein, above-mentioned member device judges whether received packet is whether the operation of known unicast message can be that broadcasting packet, multicast message or unknown unicast message are realized by judging message.Specifically:
Broadcasting packet and multicast message ratio are easier to identification, can judge whether message is broadcasting packet and multicast message according to purpose medium access control (MAC) address of message.If the highest order of the target MAC (Media Access Control) address of message is 1, then this message is broadcasting packet or multicast message.
The unknown unicast message also belongs to unicast message, is that with the difference of known unicast message the member device in the pile system can not find the destination device and the outgoing interface of unknown unicast message from transmit.For the ease of each member device identification unknown unicast message, in the present embodiment, search the member device of destination device and outgoing interface for message, when destination device that does not find certain unicast message and outgoing interface, determine that then this unicast message is the unknown unicast message, for the unknown unicast message is stamped the unknown unicast sign.It is piling up in the heading of message interpolation that this unknown unicast sign can be arranged on pile system.The described member device of searching destination device and outgoing interface for message may be a message incoming interface place member device, also may be service subcard place member device.
So, the message that receives from stacking opening when member's equipment does not carry the unknown unicast sign and judges that according to target MAC (Media Access Control) address received packet neither broadcasting packet or multicast message, can determine that then this message is the known unicast message, does not need it is carried out the loop inspection.And when received packet is in broadcasting packet, multicast message or the unknown unicast message any one, all need to carry out the loop inspection.
In the present embodiment, the operation that loop is checked can pass through to check that the source device information of message realizes, specifically:
Message incoming interface place member device can pile up heading for message adds, and writes down source device information and incoming interface information in piling up heading; If message incoming interface place member device has also been determined destination device and outgoing interface for message, also can in piling up heading, write down destination device information and outgoing interface information.Wherein, source device information and destination device information are the sign of equipment in pile system, are called equipment Mod, and source device information can be designated as SrcMod, and destination device information is designated as Destmod.
So when loop is checked, the SrcMod that member device carries according to received packet judges whether the source device of received broadcast/multicast/unknown unicast message ("/" expression or) is self, if then determine to produce loop.This checked operation can avoid member device to receive the message that oneself sends.
In practice, if member device is received identical broadcast/group broadcast/unknown unicast message from stacking opening 1 and stacking opening 2, also produced loop.In order to prevent the generation of this situation, loop checked operation of the present invention further comprises: member device judges whether the stacking opening of actual reception broadcast/group broadcast/unknown unicast message is the stacking opening of the source device of received packet to the shortest path correspondence between self, if not, then determine to produce loop.
When reality is implemented, can abandon list item by in each member device, the source being set, realize the loop inspection of broadcast/group broadcast/unknown unicast message and the operation of loop check result correspondence.Table 2 is provided with signal for the source of equipment 1 among Fig. 2 abandons list item." Y " expression in the table 2 abandons, and " N " expression does not abandon.
| | Equipment | 1 | Equipment 2 | Equipment 3 | Equipment 4 |
| Stacking |
?Y | ?N | ?N | ?Y | |
| Stacking opening 2 | ?Y | ?Y | ?Y | ?N |
Table 2
The source abandons each stacking opening that has write down member device in the list item how source device is handled for the broadcast/group broadcast/unknown unicast message of self, and how source device is handled for the broadcast/group broadcast/unknown unicast message of other member device.With table 2 is example, when equipment 1 when stacking opening 1 receives the broadcast/group broadcast that source device is an equipment 1/unknown unicast message, the source of searching abandons list item, finds corresponding be operating as " Y ", then abandons received packet.Again for example, when equipment 1 receives the broadcast/group broadcast that source device is an equipment 4/unknown unicast message from stacking opening 1, then abandon received packet.
Source shown in the employing table 2 abandons list item and realizes that the present invention need carry out the identification of message classification earlier, and the employing source abandons list item broadcast/group broadcast/unknown unicast message is carried out the loop inspection again.In practice, the decision operation of known unicast message and loop checked operation can adopt the coupling acl rule to realize.
Fig. 3 realizes preventing that for a kind of acl rule that adopts in the embodiment of the invention pile system from producing the method flow diagram of loop.As shown in Figure 3, this flow process may further comprise the steps:
Step 301: each member device when for example pile system electrifying startup, or stack system topological changes, calculates the shortest path of self other each member device in the pile system according to current topological connection situation when stack system topological is determined.
Step 302: member device generates forwarding route table according to shortest path result of calculation, according to forwarding route table the hardware forwarding table item is set.
This hardware forwarding table item is that message is in the inner forwarding rule of being followed of transmitting of pile system.The mode that generates forwarding route table according to shortest path is the known technology means, does not describe in detail here.
Step 303: member device is according to shortest path result of calculation, and stacking opening 1 and the stacking opening 2 to self issues corresponding acl rule respectively.Step 302 and 303 execution sequence are in no particular order.
The acl rule that issues to stacking opening x (x is 1 or 2) comprises following 4 class acl rules, and the matching treatment of all kinds of acl rules is operating as: abandon.
Described 4 class acl rules comprise:
The matching condition of first kind acl rule is: the highest order of the target MAC (Media Access Control) address of received packet is 1, and the source device of received packet is a stacking opening x place equipment;
The matching condition of the second class acl rule is: the highest order of the target MAC (Media Access Control) address of received packet is 1, and the source device of received packet is the member device of stacking opening x by non-shortest path connection; The quantity of this second class acl rule can be for a plurality of, concrete quantity and stacking opening x by the shortest path connection member device and pile system in the member device sum relevant;
The matching condition of the 3rd class acl rule is: received packet is carried the unknown unicast sign, and the source device of received packet is a stacking opening x place equipment;
The matching condition of the 4th class acl rule is: received packet is carried the unknown unicast sign, and the source device of received packet is the member device of stacking opening x by non-shortest path connection; The quantity of the 4th class acl rule can be for a plurality of, concrete quantity and stacking opening x by the shortest path connection member device and pile system in the member device sum relevant.
Be example with equipment among Fig. 21 still, equipment 1 issues 4 ACL to stacking opening 1, is respectively:
ACL1 is first kind acl rule, and its matching condition is: the highest order of the purpose MAC of received packet is 1, and the source device of received packet is an equipment 1;
ACL2 is the second class acl rule, and its matching condition is: the highest order of the purpose MAC of received packet is 1, and the source device of received packet is an equipment 4; Because equipment 1 is walked the stacking opening 2 of equipment 1 to the shortest path of equipment 4, do not walk stacking opening 1;
ACL3 is the 3rd class acl rule, and its matching condition is: received packet is carried the unknown unicast sign, and the source device of received packet is an equipment 1;
ACL4 is the 4th class acl rule, and its matching condition is: received packet is carried the unknown unicast sign, and the source device of received packet is an equipment 4.
Wherein, the source device matching condition in every acl rule may be a Mod value.Therefore for multicore sheet equipment, its equipment Mod value is a plurality of, and the source device matching condition in every acl rule can be a Mod value scope.The Mod value scope of each equipment is predefined.For example, the Mod value scope of default equipment 1 is A～D, and then the matching condition of ACL1 is: the highest order of purpose MAC=1, and SrcMod=A～D.
Step 304: member device receives the message from other member device in the pile system, according to the acl rule that issues for the stacking opening of actual reception message, judge that whether received packet is complementary with any one acl rule wherein, if then execution in step 305; Otherwise, execution in step 306.
Step 305: abandon received packet, this flow process finishes.
Step 306: member device is transmitted processing according to self hardware forwarding table item to received packet, and this flow process finishes.
So far, this flow process finishes.
From the flow process shown in Fig. 3 as seen, this scheme is after topology forms, and issues acl rule according to topology connection situation, and these acl rules all are effective acl rules.In this case, when change in topology, all need to generate once more and issue the effective acl rule that is applicable to current topological connection situation.Issue the time in order further to optimize, make full use of comparatively sufficient ACL resource, each member device can be when initialization, issues all possible acl rules to self stacking opening x, after determining, topology, enables effective acl rule according to current topological connection situation.Idiographic flow is referring to Fig. 4.
Fig. 4 realizes preventing that for the another kind of acl rule that adopts in the embodiment of the invention pile system from producing the method flow diagram of loop.This flow process issues the execution mode of all possibility ACL when showing initialization.As shown in Figure 4, this flow process comprises the steps:
Step 401: each member device issues all relevant acl rules to self each stacking opening respectively when initialization; The acl rule that issues to stacking opening x comprises following 2 class acl rules, and the matching treatment of each acl rule is operating as: abandon.
Described 2 class acl rules comprise:
The matching condition of a class acl rule is: the highest order of the target MAC (Media Access Control) address of received packet is 1, and the source device of received packet is each equipment that disposes for pile system in advance; Wherein, each equipment for the pile system configuration is possible add the equipment that piles up in advance, but before piling up topology formation, these equipment can't be called member device.The number of this a class acl rule equals the equipment sum for the pile system configuration.
The matching condition of b class acl rule is: received packet is carried the unknown unicast sign, and the source device of received packet is each equipment that disposes for pile system in advance; The number of this b class acl rule equals the equipment sum for the pile system configuration.
Be example with equipment among Fig. 21 still, equipment 1 issues 8 ACL to stacking opening 1, is respectively:
ACL_a1 is a class acl rule, and its matching condition is: the highest order of the purpose MAC of received packet is 1, and the source device of received packet is an equipment 1;
ACL_a2 is a class acl rule, and its matching condition is: the highest order of the purpose MAC of received packet is 1, and the source device of received packet is an equipment 2;
ACL_a3 is a class acl rule, and its matching condition is: the highest order of the purpose MAC of received packet is 1, and the source device of received packet is an equipment 3;
ACL_a4 is a class acl rule, and its matching condition is: the highest order of the purpose MAC of received packet is 1, and the source device of received packet is an equipment 4;
ACL_b1 is b class acl rule, and its matching condition is: received packet is carried the unknown unicast sign, and the source device of received packet is an equipment 1;
ACL_b2 is b class acl rule, and its matching condition is: received packet is carried the unknown unicast sign, and the source device of received packet is an equipment 2;
ACL_b3 is b class acl rule, and its matching condition is: received packet is carried the unknown unicast sign, and the source device of received packet is an equipment 3;
ACL_b4 is b class acl rule, and its matching condition is: received packet is carried the unknown unicast sign, and the source device of received packet is an equipment 4.
Step 402: each member device calculates the shortest path of self other each member device in the pile system according to current topological connection situation after the topology of pile system is determined.
Step 403: member device generates forwarding route table according to shortest path result of calculation, according to forwarding route table the hardware forwarding table item is set.
Step 404:, enable effective acl rule in a class acl rule and the effective acl rule in the b class acl rule according to shortest path result of calculation.Step 403 and 404 execution sequence are in no particular order.
The effective acl rule that enables for stacking opening x comprises:
In a class acl rule, matching condition be the highest order of the target MAC (Media Access Control) address of received packet be 1 and the source device of received packet be the acl rule of stacking opening x place equipment;
In a class acl rule, matching condition is that the highest order of the target MAC (Media Access Control) address of received packet is 1 and the acl rule of the source device of received packet each member device that to be stacking opening x connect by non-shortest path;
In the b class acl rule, matching condition is that the source device that received packet is carried unknown unicast sign and received packet is the acl rule of stacking opening x place equipment;
In the b class acl rule, matching condition is the acl rule of source device that received packet is carried unknown unicast sign and received packet each member device that to be stacking opening x connect by non-shortest path.
Suppose that the shortest path result of calculation among Fig. 2 is, equipment 1 is all walked stacking opening 1 to equipment 2 and equipment 3, walks stacking opening 2 to equipment 4.Effective acl rule of enabling for stacking opening 1 of equipment 1 comprises above-mentioned ACL_a1, ACL_a4, ACL_b1 and ACL_b4 so, and other acl rule does not enable.Effective acl rule that equipment 1 enables for stacking opening 2 comprises above-mentioned ACL_a1, ACL_a2, ACL_a3, ACL_b1, ACL_b2 and ACL_b3.
When topology connection situation changes, enable effective acl rule according to the topology connection situation after changing, can avoid each change in topology all to issue acl rule again like this.
For example, when the link failure between equipment among Fig. 22 and the equipment 3, form chain topology as shown in Figure 5, then the result of calculation according to new topology connection situation calculating shortest path is: equipment 1 is walked stacking opening 1 to equipment 2, walks stacking opening 2 to equipment 4 and equipment 3.In this case, equipment 1 enables ACL_a1, ACL_a3, ACL_a4, ACL_b1, ACL_a3 and ACL_b4 for stacking opening 1.
Step 405: member device receives the message from other member device in the pile system, according to the effective acl rule that enables for the stacking opening of actual reception message, judge that whether received packet is complementary with any one effective acl rule wherein, if then execution in step 406; Otherwise, execution in step 407.
Step 406: abandon received packet, this flow process finishes.
Step 407: member device is transmitted processing according to self hardware forwarding table item to received packet, and this flow process finishes.
So far, this flow process finishes.
In order to realize that the above-mentioned pile system that prevents produces the method for loop, the embodiment of the invention also provides the member device in a kind of pile system.Fig. 6 is the structural representation of member device in the embodiment of the invention.As shown in Figure 6, this member device comprises loop inspection unit 62 and retransmission unit 63.
Wherein, loop inspection unit 62 is used for receiving message by stacking opening, judges whether received packet is the known unicast message; If then received packet is sent to retransmission unit 63; Otherwise, received packet is carried out the loop inspection, if detect the generation loop, then abandon received packet, if do not detect the generation loop, then received packet is sent to retransmission unit 63.
This member device also comprises message process unit 64, is used to the message that is received from the pile system outside to add and piles up heading, writes down source device information and incoming interface information in the heading described piling up.If this message does not need to be redirected, then message process unit 64 is searched destination device and outgoing interface for this message, if received packet is a unicast message, and do not find the destination device and the outgoing interface of received packet, determine that then the unicast message that is received is the unknown unicast message, stamp the unknown unicast sign for the unknown unicast message, then message is sent to retransmission unit 63 and transmit processing.Message process unit 64 is when destination device that finds message and outgoing interface, and record destination device information and the outgoing interface information in the heading of piling up at message sends to message retransmission unit 63 then and transmits processing.If message process unit 64 place member devices are mounted with the application subcard, then this message process unit 64 is also for searching destination device and outgoing interface through using the message that subcard handles, and the operation of carrying out according to lookup result is not repeated in this description as hereinbefore here.
Owing to carry the unknown unicast sign in the unknown unicast message, therefore, loop inspection unit 62 is when judging whether the message that receives by stacking opening is the known unicast message, do not carry the unknown unicast sign if judge received packet, and not broadcasting packet, in the time of neither multicast message, can judge that then received packet is the known unicast message.
Judge in the loop inspection unit 62 that whether received packet is the operation of known unicast message and can adopts the mode of coupling acl rule to realize to the operation that received packet is carried out the loop inspection.When adopting this implementation, loop inspection unit 62 specifically comprises several modules as shown in Figure 7: pile up that topography module 621, ACL issue module 622, ACL is provided with module 623 and checks module 624.
Wherein, pile up topography module 621, be used for after the topology of pile system is determined, calculate the shortest path of place member device other each member device in the pile system, shortest path result of calculation is sent to ACL issue module 622 according to current topological connection situation.
ACL issues module 622, is used for according to shortest path result of calculation, determines the acl rule of each stacking opening correspondence of place member device, and is handed down to ACL module 623 is set.4 class acl rules of stacking opening x correspondence are specifically set forth in to the description of Fig. 3 aforementioned, omit here.
ACL is provided with module 623, is used to receive the acl rule that ACL issues each stacking opening correspondence that module 622 issues, and is set to corresponding stacking opening respectively.In physical device, ACL issues module 622 and is the module of software view, and ACL is provided with module 623 and is the module of hardware view.
Check module 624, receive message,, judge that whether received packet is complementary with any one acl rule wherein, if abandon received packet according to the acl rule that be the stacking opening setting of actual reception message by stacking opening; Otherwise, received packet is sent to retransmission unit 63 transmits processing.
Issue the time in order further to optimize, make full use of comparatively sufficient ACL resource, can be when the pile system initialization, each member device issues all acl rules relevant with stacking opening x to self stacking opening x, according to current topological connection situation, enable effective acl rule.When adopting this implementation, loop inspection unit 62 still comprises several modules as shown in Figure 7.The function of piling up topography module 621 is with mentioned above identical.
Under present embodiment, ACL issues module 622 and is used for when initialization, all relevant acl rules of each stacking opening correspondence of place member device is handed down to ACL module 623 is set; The relevant acl rule of all of stacking opening x correspondence comprises 2 class acl rules: a class acl rule and b class acl rule.The particular content of this two classes acl rule is specifically set forth in to the description of Fig. 4 aforementioned, omits here.
This ACL issues module 622 and is also receiving when piling up the shortest path result of calculation that topography module 621 sends, according to shortest path result of calculation, determine effective acl rule in a class acl rule and the effective acl rule in the b class acl rule, and notice ACL is provided with module 623.Wherein effectively the particular content of acl rule is specifically set forth in to the description of Fig. 4 aforementioned, omits here.
ACL is provided with module 623 and is used to receive all relevant acl rules that ACL issues each stacking opening correspondence that module 622 issues, and is set to corresponding stacking opening respectively; When receiving when issuing the notice of module 622, enable the effective acl rule that is provided with into each stacking opening from ACL.
Check module 624, be used for receiving message,, judge that whether received packet is complementary with any one effective acl rule wherein, if abandon received packet according to the effective acl rule that be the stacking opening setting of this message of actual reception by stacking opening; Otherwise, received packet is sent to described retransmission unit.
In sum, more than be preferred embodiment of the present invention only, be not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1, a kind of pile system that prevents produces the method for loop, it is characterized in that this method comprises:
Member device in the pile system receives message by stacking opening, judges whether received packet is the known unicast message; If then received packet is transmitted processing; Otherwise, received packet is carried out the loop inspection, if detect the generation loop, then abandon received packet, if do not detect the generation loop, then received packet is transmitted processing.
2, the method for claim 1, it is characterized in that, this method further comprises: the member device of searching destination device and outgoing interface for message, when destination device that does not find unicast message and outgoing interface, determine that this unicast message is the unknown unicast message, for the unknown unicast message is stamped the unknown unicast sign;
Describedly judge that whether received packet for the known unicast message is: if received packet is carried the unknown unicast sign, and not broadcasting packet, neither multicast message, judge that then received packet is the known unicast message.
3, method as claimed in claim 2 is characterized in that, this method further comprises: the incoming interface place member device of message Q piles up heading for message Q adds, and writes down source device information in the heading described piling up;
Describedly received packet carried out the loop inspection comprise:
The source device information that member device carries according to received packet judges whether the source device of received packet is self, if then determine to produce loop;
Whether the stacking opening of judging this received packet of actual reception is the stacking opening of the source device of this received packet to the shortest path correspondence between self, if not, then determine to produce loop.
4, method as claimed in claim 3 is characterized in that, this method further comprises: member device calculates the shortest path of self other each member device in the pile system according to current topological connection situation after the topology of pile system is determined; According to shortest path result of calculation, issue corresponding acl rule to self each stacking opening respectively;
The acl rule that issues to stacking opening x comprises following 4 class acl rules:
The matching condition of first kind acl rule is: the highest order of the target MAC (Media Access Control) address of received packet is 1, and the source device of received packet is a stacking opening x place equipment;
The matching condition of the second class acl rule is: the highest order of the target MAC (Media Access Control) address of received packet is 1, and the source device of received packet is stacking opening x each member device by non-shortest path connection;
The matching condition of the 3rd class acl rule is: received packet is carried the unknown unicast sign, and the source device of received packet is a stacking opening x place equipment;
The matching condition of the 4th class acl rule is: received packet is carried the unknown unicast sign, and the source device of received packet is stacking opening x each member device by non-shortest path connection;
Describedly judge that whether received packet is that the operation and the described operation that received packet is carried out the loop inspection of known unicast message comprises: according to the acl rule that issues for the stacking opening of actual reception message, judge that whether received packet is complementary with any one acl rule wherein, if then abandon received packet; Otherwise, received packet is transmitted processing.
5, method as claimed in claim 3 is characterized in that, this method further comprises: member device issues all relevant acl rules to self each stacking opening respectively when initialization; The acl rule that issues to stacking opening x comprises following 2 class acl rules:
The matching condition of a class acl rule is: the highest order of the target MAC (Media Access Control) address of received packet is 1, and the source device of received packet is each equipment that disposes for pile system in advance;
The matching condition of b class acl rule is: received packet is carried the unknown unicast sign, and the source device of received packet is each equipment that disposes for pile system in advance.
6, method as claimed in claim 5 is characterized in that, this method further comprises: each member device calculates the shortest path of self other each member device in the pile system according to current topological connection situation after the topology of pile system is determined; According to shortest path result of calculation, enable neutralize effective acl rule in the b class acl rule of a class acl rule;
The effective acl rule that enables for stacking opening x comprises:
In a class acl rule, matching condition be the highest order of the target MAC (Media Access Control) address of received packet be 1 and the source device of received packet be the acl rule of stacking opening x place equipment;
In a class acl rule, matching condition is that the highest order of the target MAC (Media Access Control) address of received packet is 1 and the acl rule of the source device of received packet each member device that to be stacking opening x connect by non-shortest path;
In the b class acl rule, matching condition is that the source device that received packet is carried unknown unicast sign and received packet is the acl rule of stacking opening x place equipment;
In the b class acl rule, matching condition is the acl rule of source device that received packet is carried unknown unicast sign and received packet each member device that to be stacking opening x connect by non-shortest path;
Describedly judge that whether received packet is that the operation and the described operation that received packet is carried out the loop inspection of known unicast message comprises: according to the effective acl rule that enables for the stacking opening of actual reception message, judge that whether received packet is complementary with any one effective acl rule wherein, if then abandon received packet; Otherwise, received packet is transmitted processing.
7, the member device in a kind of pile system is characterized in that, this member device comprises: loop inspection unit and retransmission unit;
Described loop inspection unit is used for receiving message by stacking opening, judges whether received packet is the known unicast message; If then received packet is sent to described retransmission unit; Otherwise, received packet is carried out the loop inspection, if detect the generation loop, then abandon received packet, if do not detect the generation loop, then received packet is sent to described retransmission unit;
Described retransmission unit is used for the message that is received is transmitted processing.
8, member device as claimed in claim 7, it is characterized in that, this member device further comprises message process unit, be used to message to search destination device and outgoing interface, if do not find the destination device and the outgoing interface of unicast message, determine that then this unicast message is the unknown unicast message, for the unknown unicast message is stamped the unknown unicast sign;
Described loop inspection unit is when judging whether the message that receives by stacking opening is the known unicast message, if received packet is not carried the unknown unicast sign, and not broadcasting packet, in the time of neither multicast message, judge that then received packet is the known unicast message.
9, member device as claimed in claim 8 is characterized in that, described message process unit is further used for, and piles up heading for the message that is received from the pile system outside adds, and writes down source device information in the heading described piling up;
Described loop inspection unit according to the source device information that received packet is carried, judges whether the source device of received packet is the place member device when carrying out the loop inspection, if then determine to produce loop; Whether the stacking opening of judging this received packet of actual reception is the stacking opening of the source device of received packet to the shortest path correspondence between the member device of place, if not, then determine to produce loop.
10, member device as claimed in claim 9 is characterized in that, described loop inspection unit comprises and piles up that topography module, ACL issue module, ACL is provided with module and checks module;
The described topography module that piles up, be used for after the topology of pile system is determined, calculate place member device shortest path between other each member device in the pile system according to current topological connection situation, shortest path result of calculation is sent to described ACL issue module;
Described ACL issues module, is used for according to shortest path result of calculation, determines the acl rule of each stacking opening correspondence of place member device, and is handed down to described ACL module is set;
The acl rule of stacking opening x correspondence comprises following 4 class acl rules:
The matching condition of first kind acl rule is: the highest order of the target MAC (Media Access Control) address of received packet is 1, and the source device of received packet is a stacking opening x place equipment;
The matching condition of the second class acl rule is: the highest order of the target MAC (Media Access Control) address of received packet is 1, and the source device of received packet is stacking opening x each member device by non-shortest path connection;
The matching condition of the 3rd class acl rule is: received packet is carried the unknown unicast sign, and the source device of received packet is a stacking opening x place equipment;
The matching condition of the 4th class acl rule is: received packet is carried the unknown unicast sign, and the source device of received packet is stacking opening x each member device by non-shortest path connection;
Described ACL is provided with module, is used to receive the acl rule that described ACL issues each stacking opening correspondence that module issues, and is set to corresponding stacking opening respectively;
Described inspection module is used for receiving message by stacking opening, according to the acl rule that be the stacking opening setting of this message of actual reception, judges that whether received packet is complementary with any one acl rule wherein, if abandon received packet; Otherwise, received packet is sent to described retransmission unit.
11, member device as claimed in claim 9 is characterized in that, described loop inspection unit comprises that ACL issues module and ACL is provided with module;
Described ACL issues module, is used for when initialization, all the relevant acl rules of each stacking opening correspondence in the member device of place is handed down to described ACL module is set; The relevant acl rule of all of stacking opening x correspondence comprises following 2 class acl rules:
The matching condition of a class acl rule is: the highest order of the target MAC (Media Access Control) address of received packet is 1, and the source device of received packet is each equipment for the pile system configuration;
The matching condition of b class acl rule is: received packet is carried the unknown unicast sign, and the source device of received packet is each equipment for the pile system configuration;
Described ACL is provided with module, is used to receive all relevant acl rules that described ACL issues each stacking opening correspondence that module issues, and is set to corresponding stacking opening respectively.
12, member device as claimed in claim 11 is characterized in that, described loop inspection unit further comprises and piles up topography module and check module;
The described topography module that piles up, be used for after the topology of pile system is determined, calculate place member device shortest path between other each member device in the pile system according to current topological connection situation, shortest path result of calculation is sent to described ACL issue module;
Described ACL issues module and is further used for, and when receiving described shortest path result of calculation, according to shortest path result of calculation, determines neutralize effective acl rule in the b class acl rule of a class acl rule, and notifies described ACL that module is set;
Effective acl rule of determining for stacking opening x comprises:
In a class acl rule, matching condition be the highest order of the target MAC (Media Access Control) address of received packet be 1 and the source device of received packet be the acl rule of stacking opening x place member device;
In a class acl rule, matching condition is that the highest order of the target MAC (Media Access Control) address of received packet is 1 and the acl rule of the source device of received packet each member device that to be stacking opening x connect by non-shortest path;
In the b class acl rule, matching condition is that the source device that received packet is carried unknown unicast sign and received packet is the acl rule of stacking opening x place member device;
In the b class acl rule, matching condition is the acl rule of source device that received packet is carried unknown unicast sign and received packet each member device that to be stacking opening x connect by non-shortest path;
Described ACL is provided with module and is further used for, and when receiving when issuing the notice of module from described ACL, enables the effective acl rule that is provided with into each stacking opening;
Described inspection module is used for receiving message by stacking opening, according to the effective acl rule that be the stacking opening setting of this message of actual reception, judges that whether received packet is complementary with any one effective acl rule wherein, if abandon received packet; Otherwise, received packet is sent to described retransmission unit.
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| CN108900440A (en) * | 2018-06-27 | 2018-11-27 | 新华三技术有限公司 | Message forwarding method and device |
| CN114448907A (en) * | 2022-04-11 | 2022-05-06 | 希诺麦田技术（深圳）有限公司 | Multicast flooding prevention method, device and equipment |
| CN114448907B (en) * | 2022-04-11 | 2022-07-22 | 希诺麦田技术（深圳）有限公司 | Multicast flooding prevention method, device and equipment |
| CN115412456A (en) * | 2022-08-11 | 2022-11-29 | 浪潮思科网络科技有限公司 | Loopback detection method, equipment and medium in stacking environment |
| CN115412456B (en) * | 2022-08-11 | 2023-10-27 | 浪潮思科网络科技有限公司 | Loop detection method, device and medium in stacking environment |
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